1、测试环境

硬件：wukongpi H3

系统：ubantu

镜像：Orangepizerolts_2.0.8_ubuntu_bionic_server_linux5.4.27.img

2、外设功能测试

引脚图：

1、spi

//1、系统默认关闭了SPI,打开该文件：
vi /boot/orangepiEnv.txt

//2、输入以下内容：
overlays=spi-spidev
param_spidev_spi_bus=1 #修改为开发板所支持的对应的spi 总线号

//3、保存后重启
reboot

重启后进入dev可以看到刚开启的spi

spi功能可以用杜邦线将MOSI和MISO短接，进行自收发的数据测试。
简单写了一个spi驱动测试：

测试结果：

root@orangepizerolts:~# ls
SPI_test.zip
root@orangepizerolts:~# unzip SPI_test.zip
Archive:  SPI_test.zip
  inflating: SPI_test/Makefile
  inflating: SPI_test/spi_main.cpp
  inflating: SPI_test/SpiDevice.cpp
  inflating: SPI_test/SpiDevice.h
root@orangepizerolts:~# ls
SPI_test  SPI_test.zip
root@orangepizerolts:~# cd SPI_test/
root@orangepizerolts:~/SPI_test# ls
Makefile  SpiDevice.cpp  SpiDevice.h  spi_main.cpp
root@orangepizerolts:~/SPI_test# make
make: Warning: File 'Makefile' has modification time 27539 s in the future
g++ -Wall -std=c++11 -c spi_main.cpp
spi_main.cpp: In function ‘int main()’:
spi_main.cpp:22:9: warning: unused variable ‘num’ [-Wunused-variable]
     int num =10;
         ^~~
g++ -Wall -std=c++11 -c SpiDevice.cpp
g++ -Wall -std=c++11 -o spi_test spi_main.o SpiDevice.o
make: warning:  Clock skew detected.  Your build may be incomplete.
root@orangepizerolts:~/SPI_test# ls
Makefile  SpiDevice.cpp  SpiDevice.h  SpiDevice.o  spi_main.cpp  spi_main.o  spi_test
root@orangepizerolts:~/SPI_test# ./spi_test
Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0x0 0x0 0x0

Received data: 0x0 0x0 0x0

Received data: 0x0 0x0 0x0

Received data: 0x0 0x0 0x0

Received data: 0x0 0x0 0x0

Received data: 0x0 0x0 0x0

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

Received data: 0xaa 0xbb 0xcc

^C
root@orangepizerolts:~/SPI_test#

默认发送aa bb cc，当mosi和miso短接后，接收到的数据也是aa bb cc，中间拔掉一端后无法正常接收到aa bb cc。

2、uart

//1、系统默认关闭了uart1，uart2,打开该文件：
vi /boot/orangepiEnv.txt

//2、输入以下内容：
overlays=uart1 uart2

//3、保存后重启
reboot

a) 26pin 中的 uart1 对应/dev/ttyS1
b) 26pin 中的 uart2 对应/dev/ttyS2